Heating controls
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(2010/09)
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8
Heating controls
A control unit is required to operate gas condensing
boilers. The Junkers control systems are of modular
design. This enables the system to be matched
inexpensively to the individual application and
equipment installed in the planned heating system.
8.1
Selection aids for controller application
The Suprapur gas condensing boilers are factory-fitted
with a BUS-enabled boiler control unit and without a
separate controller. Subject to application, there are
different controllers available for operating the
condensing heating system.
The room temperature-dependent and
weather-compensated controllers communicate with
the boiler control unit via the 2-wire BUS system. Up to
32 subscribers can be connected to this BUS to
exchange data; these might be controllers, function
modules and/or remote controls.
The weather-compensated controllers in particular
stand out thanks to their flexible use. They may be
mounted on the wall next to the boiler and can be
controlled from any other room using a remote control.
On the other hand, the room temperature-dependent
controller must be installed inside the room that is
decisive for the temperature (lead room).
Controllers are selected subject to the demand profile
and their respective performance. The following
overview shows which controller can meet the essential
requirements and which further function modules are
required to achieve the stated aims.
The overview enables a preselection of the controller
system. The applications shown represent standard
cases. Finally, the control system must be suited to the
hydraulic system conditions. Generally, we would
recommend using a weather-compensated controller
when utilising a condensing system. This method of
control minimises the return temperature via a variable
flow temperature, thereby optimising the utilisation of
condensing benefits.
Fig. 36
Extended functionality and controllers
Subject to the selected controller, the following
functions are available:
•
Solar-optimised DHW heating
•
Solar-optimised heating circuit
•
Heat-up speed selection
•
Thermal disinfection
•
Screed drying
•
Optimised heating curves for different types of
heating system (radiators, convector heaters,
underfloor heating)
•
Pump economy function
•
Display of the solar yield by the controller
•
Extended fault recognition regarding system and
installation
•
Controlling DHW circulation
